EZP-23432: Moved the draft handling a dedicated plugins
Changed the REST model to use the document property of the Response object
Removed useless parse implementation in the content type model
Changed the default value of the fieldDefinitions attribute of type model
Make sure to parse the id of content in the corresponding model
EZP-23432: Implemented the content creation in the content model
EZP-23432: removed Version#loadNew and implemented the lifecycle of the version
EZP-23432: removed the `createMode`

the data either comes from the previous version or from the user